The Washer,recessed, cataloged under National Stock Number 5310-01-378-7631, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bae Systems Information and Electronic Systems Integration Inc.. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-378-7631 |
| Primary Part Number | A312A168-101 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bae Systems Information and Electronic Systems Integration Inc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.645 INCHES MINIMUM AND 0.655 INCHES MAXIMUM IN |
| Material Thickness | 0.125 INCHES NOMINAL IN |
| Recess Diameter | 0.320 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Material | STEEL COMP 630 OVERALL |
| Hole Diameter | 0.259 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN |
| Recess Angle | 80.0 DEGREES MINIMUM AND 100.0 DEGREES MAXIMUM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A312A168-101 PRIMARY | Bae Systems Information and Electronic Systems Integration Inc. (USA) |
| Reference | Meaning |
|---|---|
| A312A168-101 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-378-7631 is a Washer,recessed, manufactured by Bae Systems Information and Electronic Systems Integration Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-378-7631 has 1 manufacturer part number on file: A312A168-101 (Bae Systems Information and Electronic Systems Integration Inc.).
Key specifications for A312A168-101: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: RECESSED; Material Document and Classification: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.645 INCHES MINIMUM AND 0.655 INCHES MAXIMUM IN. 11 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.